Electrical pulse counters – pulse dividers – or shift registers: c – Shift register – Shift direction control
Patent
1985-07-24
1987-05-12
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Shift register
Shift direction control
377 70, 364715, G11C 1900
Patent
active
046655387
ABSTRACT:
A bidirectional barrel shift circuit includes an input switching circuit having a plurality of parallel input lines and the corresponding number of first and second signal line pairs associated to the respective input lines. This input switching circuit is operative to selectively connect each of the input lines to one line of the associated first and second signal line pair. There is also provided an output switching circuit connected to all the first and second singal lines and having output lines of the number corresponding to that of the input lines. This output switching circuit is operative to connect either the first signal lines or the second signal lines to the corresponding output lines. A barrel shift matrix is connected to the first and second signal lines and is controlled by a shift number controller so as to produce between the first and second signal lines a connection pattern sufficient for realizing a given shift number. A shift direction controller responds to a shift direction signal to control the input switching circuit so as to alternatively connect the input lines to selected one lines of the first and second signal lines and at the same time to control the output switching circuit so as to connect the other signal lines to the corresponding output lines.
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VLSI Systems by Mead & Conway, Addison-Wesley Publishing Co., Oct. 1980, pp. 157-162, "Barrell Shifter".
"High-Speed Shifter Array", by J. E. Gersbach, IBM Technical Disclosure Bulletin, vol. 21, No. 4, Sep. 1978, pp. 1379 and 1380.
"Algebraic/Logical Shift Matrix", by J. E. Gersbach, IBM Technical Disclosure Bulletin, vol. 23, No. 1, Jun. 1980, pp. 120-122.
Heyman John S.
NEC Corporation
Ohralik Karl
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